Recovery of hydrogen from refinery and petrochemical light ends streams

a technology of light end streams and hydrogen, which is applied in the direction of cold treatment separation, liquefaction, lighting and heating apparatus, etc., can solve the problems of releasing carbon dioxide into the atmosphere, the byproduct hydrogen is not enough to meet the demand, and the cost of hydrogen is about three times as much, so as to achieve high yield and purity
US20050047995A1Inactive Publication Date: 2005-03-03WYLIE
12 Cites 20 Cited by

Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
WYLIE
Publication Date
2005-03-03
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
Patent Text Reader

Abstract

A process for recovering hydrogen from a stream comprised of hydrogen, non-condensable gases, and propane and lighter hydrocarbons, wherein the process comprises the steps of stripping hydrogen and non condensable gases out of the feed light ends stream with methane vapor, washing the stripped hydrogen stream with liquid methane to absorb the non condensable gases, and washing the hydrogen stream with a hydrocarbon lean oil such as liquid ethane to absorb methane, to produce the product hydrogen stream.
Need to check novelty before this filing date? Find Prior Art

Description

FIELD OF THE INVENTION

[0001] This invention relates to recovering hydrogen from light ends streams produced in petroleum refineries and petrochemical plants. BACKGROUND OF THE INVENTION

[0002] Hydrogen is used in petroleum refineries to remove sulfur from fuel products and to saturate olefins and aromatics to make chemical products. Hydrogen is produced as a byproduct in petroleum refineries and petrochemical plants. Byproduct hydrogen collects in light ends streams containing light hydrocarbons and also non-condensable gases-including carbon monoxide, carbon dioxide, and nitrogen. The light ends streams are usually processed to recover propane, propylene and heavier hydrocarbons using conventional fractionation techniques at ambient temperatures, and then further processed to recover ethylene, ethane and hydrogen at cryogenic temperatures. Streams processed at low temperatures are usually dried to remove water and treated to remove corrosive compounds including hydrogen cyanide, h...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More